Troubles updating to Vanilla 2.6 on Ubuntu - HTTP ERROR 500
This one's gonna be a bit awkward.
When accessing my forum after updating to Vanilla 2.6, I've been getting HTTP ERROR 500 every time I go to visit it.
The error in my apache log is:
[Thu May 17 15:21:37.263116 2018] [:error] [pid 1205] [client 184.108.40.206:51577] PHP Fatal error: Cannot redeclare formatRssHtmlCustom() (previously declared in /var/www/html/forum/plugins/HtmLawed/class.htmlawed.plugin.php:238) in /var/www/html/forum/library/core/functions.render.php on line 939, referer: https://[website]/forum/
The forum appears to work when I temporarily delete the HtmLawed plugin, but I'm not sure on what side-effects that would have and there's some errors complaining that it's missing when Debug Mode is on. That, and the admin dashboard just becomes a bit of a jumbled mess, which is less than ideal. (The forum itself seems to work fine with it missing, though.)
I feel like this is yet another dumb question thanks to my own admittedly rookie knowledge on this, but I'm really not sure on what to do at this point. I assume I need the plugin for some things to work properly (for all I know, it missing could be the thing causing the dashboard to break), so I'd rather get this sorted if I can.